Commitments - Additional Information (Detail)	6 Months Ended
Jun. 30, 2019 USD ($)
Deferred underwriting fee payable	$ 8,050,000
Deferred underwriting fee rate	3.50%
Private Placement [Member]
Initial business combination securities transferred	$ 150,000,000
LD [Member] \| Private Placement [Member]
Commitment In Connection With The Merger	$ 50,000,000

Fees directly attributable to underwriting which are deferred at the end of the reporting period.

No definition available.

Name:	pvt_DeferredUnderwritingFee
Namespace Prefix:	pvt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Deferred Underwriting Fee expressed as a percentage on gross proceeds of the offering.

+ References

No definition available.

+ Details

Name:	pvt_DeferredUnderwritingFeeRate
Namespace Prefix:	pvt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=pvt_LdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: